SPIRV-Tools/source/fuzz/transformation_add_global_undef.cpp
Alastair Donaldson fcb22ecf0f
spirv-fuzz: Report fresh ids in transformations (#3856)
Adds a virtual method, GetFreshIds(), to Transformation. Every
transformation uses this to indicate which ids in its protobuf message
are fresh ids. This means that when replaying a sequence of
transformations the replayer can obtain a smallest id that is not in
use by the module already and that will not be used by any
transformation by necessity. Ids greater than or equal to this id
can be used as overflow ids.

Fixes #3851.
2020-09-29 22:12:49 +01:00

67 lines
2.4 KiB
C++

// Copyright (c) 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "source/fuzz/transformation_add_global_undef.h"
#include "source/fuzz/fuzzer_util.h"
namespace spvtools {
namespace fuzz {
TransformationAddGlobalUndef::TransformationAddGlobalUndef(
const spvtools::fuzz::protobufs::TransformationAddGlobalUndef& message)
: message_(message) {}
TransformationAddGlobalUndef::TransformationAddGlobalUndef(uint32_t fresh_id,
uint32_t type_id) {
message_.set_fresh_id(fresh_id);
message_.set_type_id(type_id);
}
bool TransformationAddGlobalUndef::IsApplicable(
opt::IRContext* ir_context, const TransformationContext& /*unused*/) const {
// A fresh id is required.
if (!fuzzerutil::IsFreshId(ir_context, message_.fresh_id())) {
return false;
}
auto type = ir_context->get_type_mgr()->GetType(message_.type_id());
// The type must exist, and must not be a function type.
return type && !type->AsFunction();
}
void TransformationAddGlobalUndef::Apply(
opt::IRContext* ir_context, TransformationContext* /*unused*/) const {
ir_context->module()->AddGlobalValue(MakeUnique<opt::Instruction>(
ir_context, SpvOpUndef, message_.type_id(), message_.fresh_id(),
opt::Instruction::OperandList()));
fuzzerutil::UpdateModuleIdBound(ir_context, message_.fresh_id());
// We have added an instruction to the module, so need to be careful about the
// validity of existing analyses.
ir_context->InvalidateAnalysesExceptFor(
opt::IRContext::Analysis::kAnalysisNone);
}
protobufs::Transformation TransformationAddGlobalUndef::ToMessage() const {
protobufs::Transformation result;
*result.mutable_add_global_undef() = message_;
return result;
}
std::unordered_set<uint32_t> TransformationAddGlobalUndef::GetFreshIds() const {
return {message_.fresh_id()};
}
} // namespace fuzz
} // namespace spvtools